Back to basic SDL application boilerplate

1 files changed, 22 insertions, 0 deletions

diff --git a/src/mandelbrot.c b/src/mandelbrot.c
new file mode 100644
index 0000000..a996b26
--- /dev/null
+++ b/src/mandelbrot.c
@@ -0,0 +1,22 @@
+#include "mandel.h"
+
+int mandelbrot(double ca, double cb)
+{
+    double zr = ca;
+    double zi = cb;
+    double zr_square;
+    double zi_square;
+    int n;
+    for (n = 0; n < 20; n++)
+    {
+        zi_square = zi * zi;
+        zr_square = zr * zr;
+        if (zr_square + zi_square > 4)
+            return n;
+        zi = 2 * zr * zi;
+        zr = zr_square - zi_square;
+        zi += cb;
+        zr += ca;
+    }
+    return n;
+}